Vandersteen 2w with higher sensitivity speakers

I own an older 2w subwoofer and the max gain setting is 94 db. I was wondering how it would work with a OB speaker using the Visaton B200 and Eminence Alpha 15 woofer which are 96 db efficient according to their spec sheet. Would the actual efficiency once installed in a baffle be the same or less. Would there really be a difference for the 2W? Thanks.