It's a guitar head. Hence the name, Concert Lead, as opposed to the Concert Bass.
That said, who cares? The Fender Bassman was a bass amp, which has been revered for decades as a guitar amp. The Concert Lead has reverb and a distortion circuit, one in each of its two channels. The Concert Bass has neither in its one channel. The tone circuitry may be different, I'm not sure. The questions that remain are, will it function as a bass amp? Yes, it will. Will you like the tone(s) it produces? Only you can answer that one, and only after you try it out.