90q radiator the same as 4kq/coupe radiator?

[John & Liesl Karasaki <johkar@teleport.com>]

Hi all.  List member Chris Semple is out of the 4kq radiators he sells.  I
have been unable to round up a 4kq radiator for under $200 even when
visiting the usual (cheap) suspects (Halsey, Olympic, etc.).

These places do, however, have a radiator for a Audi 90 for about $130!
Are these comparable parts?  Sorry for the wasted bandwidth, but that is
the one Audi model I don't have access to.

TIA.