Is a VL3030 a suitable replacement for a ML2430
The price difference may be a reflection of supplier profit or material costs but not performance but the big difference is coin cell volume ratio. ~2:1
I see these rechargeable coin cells as almost identical performance yet use different marketing graphs.
The most important one spec initially is that they have the same Capacity and ESR.
The second might be your 1st priority and that is longevity.  In this regard both follow Peukert's Law and both seem to be identical.
The important thing to see here is if your charge cycles.

at 100% DoD both get 4Ah,  net total in their &quot;life time.&quot;

at 50% DoD both get 5Ah

at 10% DoD both get ~10Ah


Therefore both are equivalent, even though the Panasonic you say is cheaper and better availability.
Panasonic VL3032 volume  \$\pi *15^2*3.2=720 mm^3\$  is more conservative (lower E-density)
FDK . . . ML2430 volume  \$\pi *12^2*3.0=430 mm^3\$