You should be fine. Do you have the old hex file in case you want to go back to an older version again?
robotfuzz works quite well. yes I suspect the only thing is the steps/mm for extruder. So you can calibrate that and set it to whatever you want.
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chopmeister 0
The E-steps in the firmware don't really matter if you set them in Cura machine settings. Those will override any value in the firmware, and the firmware from marlinbuilder should work just fine with your machine.
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