I believe it will be okay to use both. You realize that with the amount of heat you are going to create that they will crack. Some of the producers that have built these type of evaporators have lined the inside with firebrick. They help hold in the heat.
2004 - 2012 2x3 flat pan 25 to 60 taps
2012 2x3 new divided pan w/draw off 55 taps
2018 - didn't boil surgery - bought new evaporator
2019 new SML 2x4 raised flue high output evap. 65 taps
made 17 gal. syrup
2020 - only put out 53 taps - made 16.25 ga.l syrup
2021 - Didn't work out
2022 - 25 taps on bags / 8 taps on 3/16's line - late start