What drawings were you looking for specifically?
To answer your question, probably not, but 90% of the parts in a Harvard Mk 4 have NAA prefixes (ie 19-, 36-, 52-, 66-, etc) so there is a pretty good chance the T-6 blueprints will have what you're looking for.
The only ones they definitely won't have are the Noorduyn-built parts with an '07' prefix.
Aircorps Aviation just launched their 'Aircorps Library' that among other types has over 12,000 T-6/SNJ/Harvard drawings that are viewable online and are searchable by part number. The $25 user fee is worth not having the hastle of searching through the microfilms from the NASM.
http://aircorpslibrary.com/