see AMC 66.A.45(d);(e)3;(f)1;(g)1;(h) Endorsement with aircraft ratings for the typical basic experience requirements in addition the same basic skills for a B2 would need to be demonstrated you can only certify Group 2 ,3 & 4 aircraft..
if it was me, I'd do the extra bit of work for the B2
What Authority would you be applying to ?
Edit : yes you need a minimum of at least one system rating for the type (or group) as applicable