If a description in D&D 5e is lacking, is it valid to refer to an older edition?

In 5e, Tenser’s Floating Disc

follows you so that it stays within 20’ of you.
(5e PHB282)

The spell description does not make mention of its travel rate, but in 3.5e the description says:

It floats along horizontally within spell range and will accompany you at a rate of no more than your normal speed each round. (3.5e PHB294)

Could the lack of follow speed in 5e be extrapolated from the description in 3.5e?