The 648 is significantly different.
I recall some rumors that the 634 was similar enough it could be used, with some adaptation, but I don't recall the details now.
I've got the chart scanned for a 561, which is applicable, however each page is fairly high resolution and weighs in at 80MB a pop. (far to large to email.) I never did get around to cleaning it up.
In the mean time the 6BQ5 should be attached. Let me run the scans I have through some conversion, and I can at least post the raw scans somewhere to download later today/tomorrow.
David
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