I’d like to use both, with preferably the same account, but mainly the same android app
Honourable mention to piefed.social / pyfedi which can do both as well.
However, it’s newer than mbin and I’m not sure about mobile apps working with it.
Someone creates a version which adds a Lemmy compatible api to pyfedi and tested out a couple of mobile apps against it, https://codeberg.org/rimu/pyfedi/issues/13#issuecomment-1814982
So it’s not impossible - but it’s also very much a YMMV thing (I suppose it’s really still only for developers atm)