Can bulb shape different than specs if everything else meets specs?

Hello everyone,
I have a two new fixtures I just hung and a they take T10 and G16 bulbs.
My question is, can I use a xxxxxx B or C bulb shape xxxxxxx (e.g.B10 bulb) if it has the xxxxxxxx same specs and base (E26) in place of the T10?
Basically, the owner does not like the look of the T and G bulb shape and like the Candelabra look…

There’s no reason why you couldn’t use a different shape lamp in a fixture if it has the same base type and voltage rating.

[Edit, I appear to have failed to notice that this is simply spam]