This can't be an uncommon question, but I couldn't find an existing answer....

Are baggage allowances the same on both legs of an RT when flights are operated by different *A partners? Are things set based on the first flight of a PNR or does it vary?

For example, I'm flying SFO-FRA on UA and FRA-WRO on LH Cityline, then back on the same carriers. As a GS, I get two free bags outbound. Is it the same on the return, or is Cityline going to give me grief? (They've tried to charge me before, but a supervisor stopped them.)