No, and I would bet the lawnmower blenny would kill your bi-color blenny.
As Bernie21 suggested, you may be able to keep a Midas blenny with a combtooth blenny. Or you may be able to keep a fanged blenny with a lawnmower, but mixing two combtooth blennies will almost positively result in the death of one (unless you have a huge tank, even then...). IME, lawnmower blennies are one of the more aggressive blennies out there.