No they don't! Operationally, Rafale is aimed on different tasks than heavy class fighters. Only because we can buy more MKIs, doesn't mean it would be good to use such a big and operationally costly fighter in any mission. In fact it's even better to have Rafale taking over some of MKIs roles, to reduce costs and not be too dependent on a single fighter. FGFAs aim is to make full use of the stealth advantage, not to use it in basic air defence or CAS roles, so there is no relation to the Rafale there.
The prime aim of MMRCA however is the industrial benefit we aim on in return for the money we spend. The FGFA industrial benefit is not aimed of offset, but on joint ownership and implementing own requirements into the development. Again, no relation between both procurements.
We need both fighters and both projects for different operational and industrial benefits and we will try to get the most out of both through the current negotiations.