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Thats correct. The primary piston (23mm) fluid actuates the rear piston 19mm. They are not mechanically linked unless in event of one circuit failure, so equal pressure in both front and rear master cylinder pistons. The step is for volume not pressure.
I've built many bugs with 944na, 944t, 986, 986S/996 with stock beetle 19mm dual circuit mc with great results. Pedal feel is really good, except the 944na where it is slightly low... if that is unacceptable to customer then I put in the 944mc.
With split busses I typicaly build them (944na, 986, 996 etc) with early modified single circuit mc. Yup single circuit, works awesome. Due to pedal ratio the 944NA brake system on single mc works well without as low a pedal as beetle. Again for higher pedal I can use 944mc as option but typical isnt an exercised option by my customers. (Single bus is 22mm mc).
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