power supply base on Pass Labs X2

I want to build the regulate power supply base on Passlabs X2's power supply.
The original on use two transformer to form a network of four 40volt rails attached in series and feed to the regulator as show in pic#1
For mine, I wanna use only one transformer. So, may I use the schematic as shown in pic#2. the 2 seconday form 40volt and 120volt rails to feed the regulator to get the same regulated voltage.

My quesion :
  • Is there any difference between two of this in term of performance? apart of using higher voltage cap.
  • Can I use IRF610 mosfet instead of IRFP240 for the plus voltage rail? since the the current draw from the psu is about 60mA. Is there a special reason why IRFP240 is picked for this job?

Thank you.


org.png


sim.png
 
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