The following mail is from someone who tried such a thing and verified that it really works.
From firstname.lastname@example.org Thu Jan 30 00:45:36 1997 Received: by thillana.lcs.mit.edu (5.65/DEC-Ultrix/4.3) id AA29667; Wed, 29 Jan 1997 19:44:34 -0500 Date: Wed, 29 Jan 1997 19:44:34 -0500 From: email@example.com (Patrick Sobalvarro) Message-Id: <9701300044.AA29667@thillana.lcs.mit.edu> To: firstname.lastname@example.org (Rui Pedro Mendes Salgueiro) Subject: interchangeability of SCA 300 adapters Status: OR Since you were kind enough to respond when I sent you mail a couple of weeks ago asking whether a Metz SCA 351 adapter could be used on a Braun SCA 300 flash, I wanted to tell you the results of my attempting this. I took my Braun Ultrablitz 34m down to a shop where they had SCA 351 adapters, attached one, tried it out on my R6, and all the displays appear to function as they should for TTL OTF metering. I bought the adapter, but that was only this afternoon so I haven't seen results on film yet. So, here's another datapoint that says you can interchange these adapters among flashes made by different manufacturers. -PatrickThe SCA 3000 is, to the best of my knowledge, only used by Metz.