A metric 4613 size is probably obsolete or non-existent now.
If you can solder the Cathode to the thermal pad OK, any size bigger will do as they have the same voltage.
The problem is the designer neglected the effects of Thermal Runaway when the ESR of the three (3) Blue in series does not match the ESR of the three (3) White in series.
Power at 80mA*3.2V = 1/4W and ESR will be approx 4 Ohms =+/-50% or 12 Ohms with 3 in series.
There is a trick to compute tolerance of ESR vs thermal resistance which causes Shockley effect or NTC voltage but is beyond scope here.
Replace all B,W LEDs with 5050 size chips from same vendor and specs.
https://www.digikey.ca/product-detail/en/XZCB25X92S-4/1497-1089-1-ND/4745492
Consider adding 0.3R~1R in series with each color in parallel. I call this the Shockley compensation equalizer to prevent thermal runaway.
Then add water clear epoxy coating to prevent moisture damage.
The result should be a much more reliable and brighter product as this design had 2 faults.
You can use AWG 30 or 40 wire to solder Anode to tracks. Solder time 3s max.
I might even scrap the FR4 board and retrofit MCPCB with Blue and White emitters.
This 10 yr old design is lacking some reliability.