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Yes, many. FVWM and Openbox are two completely different WM-s, for example,Does FVWM have certain features that simply do not exist in some of the other more user friendly stacking wm, such as Openbox?
there is no buttons/dockapp support in Openbox, while it is pretty usable in FVWM,
and FvwmButtons is only one of many others FVWM modules, which of course
doesn't exist in Openbox. For example, it is possible to control your FVWM WM via terminal,
using such modules like FvwmConsole (it should open WM console) or like FvwmCommand,
with FvwmCommand you're able to enter WM commands via your regular console directly
% FvwmCommand 'All Iconify'should minimize all windows), it
is very useful to check some FVWM functions before adding it to config.
So while Openbox is pretty regular and pretty limited WM (nothing special IMO),
FVWM is a much more than a regular WM, because it is extremely much more customizable and usable.