Phew, having trouble scanning. Only doing half a picture, but .. better than nothing. ARE YOU READY FOR MY RESPONSE ....... (and if you tell me this building wasnt built then, I will CRY!) - i dont think the second building is a church at all ......
BANK HOUSE, thats what I think the building in the background of the Christ Church photo is ..... BANK HOUSE!
This view would also be in the artists sight I am sure. What we see here is the side wall of Bank House and a "tower" which I think is what can be seen on your sketch.
Well ..........??????