What frames are the same?

Your SECA is similar to a DOHC Maxim 400.
But the DOHCs have a different frame design - mono shock with the engine itself is a structural member.
You will need to be careful as parts for the SOHC, while much more plentiful, do not fit - apparently some suppliers don't always listen when you order and send you the wrong parts. So always stress it's for the DOHC.
 
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