I don't think that you need a theme sample. I you still said, they never fit 😉
But there are several other possibilities.
One is using the format painter tool. Look for a smart icon with a paint brush. With it you can tranfer properties like colors and fonts from one object to another. Or from one (default) to several other objects.
Next is
settings --> doc props --> general tab with plenty of default values (ok, for your next app)