The AV3Sb5 (A=K, Rb, Cs) Kagome superconductors have been reported to exhibit a wide array of unconventional superconducting behaviours. However, much of this interesting phenomenology occurs within the backdrop of the charge density wave (CDW), motivating a closer look at how the CDW may shape superconductivity. To address this, we study in detail the coupling to coherent CDW amplitude mode fluctuations through time- and angle-resolved photoemission spectroscopy (tr-ARPES) measurements on (Cs,K)V3Sb5. We find that the coupling to the amplitude mode is highly band-selective in a way that is reminiscent of the reported multiband superconducting character. Surprisingly, despite its lower Tc, we observe additional coupling channels in the K-compound that are not present in the Cs-compound, suggesting a connection between their Tc difference and multiband nature.