I don't know the answer to your question, but maybe this information from John Smith's website will help, if you haven't already looked at it:
Part number identifiers cast into 134 and 172 engine blocks (lower right side)
EAE 6015 - 134 1953-1957
EAF 6015 - 172 1953-1957
310905 - 134 1958-1959
310609 - 172 1958-1959
B9NN-6015C - 134 late 1959 early 1960
B9NN-6015A - 144D late 1959 early 1960
B9NN6015J - 172 late 1959 early 1960
B9NN6015B - 172D late 1959 early 1960
C0NN-6015G - 134 sleeveless late 1962-1964
C0NN-6015H - 144D late 1960-1964
C0NN-6015C - 172D-G late 1960-1964
C0NN-6015J - 172 late 1960-1964
Based on this it's not clear if the diesel required a different block. I can tell you that my '60 961 has block casting B9NN-6015B which according to above is a diesel block but the tractor is gas powered.
Someone will be along with better tech info... Will
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