Input voltage gain on levinson amps ?

What I am trying to find is this,can I run both power amps 29 and 20.6 at the same time through one pre amp and get the same volume level to the speakers.In other words will one set of speakers running on the 20.6 be loader than another set of speaker in another room using the 29 amps
Hope you can help
alwyn

Sorry for confusion on this question,but I was asking on behalf of a feiend and did not understand what he was looking to do,I know now and this is what he is looking to do.He has two sets of amps the 20.6 and the 29 he wants to use bot sets of amps to bi amp his speakers one set of amps for lower and the other for higher,and he is asking would they blend ok in both volume and sound qaulity

Well Arthur you have certainly gone to a lot of trouble for my benifit,and I thank you most sincerely for the information.
alwyn

I would just add a little footnote to all your kind comments in reply to my question,and its this.I live in the uk.and yet if ever I need help and advise in the hi-fi field I come to Audiogon in the us. to get it,this forum has brains and is always friendly,totaly different to what I find over here.
One agai thank you
alwyn