@emilianoksa - I recently replaced my G19 Gen.3 spring with the one from this set (yes, after stretching during re-assembly), so can confirm they do indeed use the same springs for all three of their most recent models (G19 Gen.3, G19 Gen.4 & G17 Gen.4).
I will add though, the only "downside" is the trigger pull will be slightly heavier than with the stock Marui spring. However as TM's is so light, you may consider that a good thing (a bit more realistic).