Hi Todd,
Your first is certainly is not a 15 foot 50# model Old Town from the 1970s. It looks much older, possibly Old Town but could be from another builder based upon images provided. It is closed gunwale and appears to have un-tapered ribs.
Second canoe - not enough visible information to assess. Photos of the exterior of the canoe usually don’t provide much information. As Dan mentioned, good images of the decks, as well as images of seats, thwarts, and the profile of the stems, would be most valuable for identification.
Looking forward to seeing more,
Michael