1.Aiscompletely/totally/entirelydifferentfromB.
2.AandBaredifferentinsome/everyway/respect/aspect.
5.ThedifferencebetweenAandBis/liesin/existsin…
6.Comparedwith/Incontrastto/UnlikeA,B…
7.A…,ontheotherhand,/incontrast,/while/whereasB…
8.WhileitisgenerallybelievedthatA…,IbelieveB…
9.Despitetheirsimilarities,AandBarealsodifferent.
10.BothAandB…However,A…;ontheotherhand,B…
11.ThemoststrikingdifferenceisthatA…,whileB…