Hello @sentinel dg
I can’t comment on the impact on the C2RCC processor, I’m afraid. The intricacies of the processor are unknown to me. All I can say is that the significant changes for L1C in PB04.00 involved changes to the handling of Quality Masks (they are JP2 now, not GML) and the introduction of the Radiometric Offset.
Sorry I can’t be more help.
Cheers
Jan