Would a Variant Tiefling make for a good pc Satyr? [on hold]

Though I know this might be highly classed as a DM ruling, I am asking this here both because the DMs I know class out Homebrews as playable characters for imbalance and I would like to verify that I am well understanding the text as written. (more the latter)

In SCAG, the sidebar mentions (emphasis my own):

Appearance. Your tiefling might not look like other tieflings. Rather than having the physical characteristics described in the Player’s Handbook, choose ld4 + l of the following features: small horns; fangs or sharp teeth; a forked tongue; catlike eyes; six fingers on each hand; goat-like legs; cloven hoofs; a forked tail; leathery or scaly skin; red or dark blue skin; cast no shadow or reflection; exude a smell of brimstone.

In Unearthed Arcana-Fiendish Options, Disapter bloodline is described as:

The great city of Dis occupies most of Hell’s second layer. It is a place where secrets are uncovered and shared with the highest bidder, making tieflings tied to Dispater excellent spies and infiltrators.

Legacy of Disapter states:

You know the thaumaturgy cantrip. When you reach 3rd level, you can cast the disguise self spell once with this trait and regain the ability to do so when you finish a long rest. When you reach 5th level, you can cast the invisibility spell once with this trait and regain the ability to do so when you finish a long rest. Charisma is your spellcasting ability for these spells.

Given those attributes, and the fact that Satyrs are based on Pan, a mischevious trickster god, could you use the traits of a Variant Tiefling with cloven hoofs on the end of goat legs and small horns/tail with a Disapter bloodline as a balanced base to make a playable character Satyr?

What’s the difference between a Tiefling and a Cambion?

I always thought that Cambions (only considering Infernal Cambions here for simplicity) were half devils, whereas Tieflings were more distantly related to devils.

From the PHB, pg. 42:

Tieflings are derived from human bloodlines, and in the broadest possible sense, they still look human. However, their infernal heritage has left a clear imprint on their appearance.

And

… tieflings know that this is because a pact struck generations ago infused the essence of Asmodeus—overlord of the Nine Hells—into their bloodline.

And from the MM, pg. 36:

A cambion is the offspring of a fiend … and a humanoid (usually a human).

But then from Xanathar’s Guide to Everything, we have this table on page 62:

Tiefling Parents

d8 Parents

1-4 Both parents were humans, their infernal heritage dormant until you came along.

5-6 One parent was a tiefling and the other was a human.

7 One parent was a tiefling and the other was a devil.

8 One parent was a human and the other was a devil.

These last two entries on this table are what confuse me. So apparently a tiefling can be a half devil as well? Then what makes it different from a cambion? Is there a difference? Is a cambion basically just a “monster manual” tiefling as opposed to a playable race tiefling?

Note that I’m chiefly interested in 5e, but if information from older editions is required to explain this, I’ll accept that information too, but I’d prefer 5e information.

Can a Tiefling Subrace be Feral?

Mordenkainen’s Tome of Foes offers the option to select a different heritage for a Tiefling by replacing the default Ability Score Increase with its own (as well as by replacing the Infernal Legacy trait):

The traits of the chosen subrace replace the tiefling’s Ability Score Increase and Infernal Legacy traits given in the Player’s Handbook

Swords Coast Adventurer’s Guide offers variant tieflings by either replacing Infernal Legacy (for Winged, Hellfire, or Devil’s Tongue) or by replacing one Ability Score Increase trait with another increasing feature (Feral):

Feral… This trait replaces the Ability Score Increase trait.

While a non-Asmodeus Tiefling subrace is not compatible with Winged, Hellfire, or Devil’s Tongue (since they both replace Infernal Legacy with their own option), a non-Asmodeus Tiefling subrace may be eligible for Feral (by replacing the subrace’s own Ability Score Increase with the Feral one). Is it?