IIRC its a 970, the BM and EKi are pretty similar, the '7 is tip up carry and the 970 is tip down, i very much prefer the tip up of the EKI, the F&F and materials are pretty close, some say the BM liners are better but i have had liner probs with a 975 the larger model, which BM fixed, of the 2 i would prefer the EKI over the BM myself, nothing wrong really with the BM though, a lot of it is i dont like tip down carry as much.
as far as a swap i would do it if i wanted the 970 i suppose, i think the BM would be worth at least as much if not a little more, just depends on what ya want.