It seems to me the answer is no, as someone explained it to me it is the "analogy of sleeping on your bed"....the under you is "consistent" but you adjust the top layer.....seems right....

I ask because I have a JRB 30 degree UQ that gets 'marginal" in early Spring and late Fall in New England area...

I have opportunity to "trade" + ( very minimal $ outlay) for a 5-10 degree JRB....other than a small amount of weight/bulk, no reason not to, correct?

Rather have a ? and not need it attitude, right?