i think that if they basically come from same type of backgrounds, then it wouldnt be such a deal for either side to put on/take off a shtreimal, however, if it is an issue,then maybe even though it wont seem like this to the shadchan that maybe they arent that similar- and a very important thing in a marriage is to have similar backgrounds.
I know a shadchan personally that has done approximately 60 shidduchim and the way he works is he basically says the details but he leaves out some minor details for example- the boy is 23 and the girl is 19, then hell say that the boy is appx 22…not 10% sure-hell beat around the bush bec such a minor detail is noot a major factor after marriage, but before marriage ppl tend to get all overwhelmed..such a big age difference..etc. and as this shadchan says- whats the difference what age you are- so that in 75 years one will be 93 and one will be 97? and i totally agree. whats the major difference.
I definitely think that there is nothing wrong with leaving out some minor details until later- unless these details can later on ruin the marriage.