The replacement ball joints I got for my SL were Moog boxed with Lemforder logos on the boot and plastic bag.

The original joints were TRW. The steering joints were Lemforder.

Many aftermarket parts companies make OE parts for car makers. ( auto makers make few parts, most are outsourced even if it is to one of their spun off companies ) There can be a difference betwen OE and replacement parts from the same maker as the replacement part business is price driven.