GT Front end help needed, GT vs ST Options

[6GenDad]

Please help! I need some advice on a donor vehicle to repair a 94 GT. Due to an unfortunate incident, my son needs to replace all the sheetmetal and internal structure on the front of his 94 GT from the center of the front wheel well forward. The drivetrain is intact. Must the donor car be a GT also, or are there differences between the ST and GT in either the engine mounts, structure or electrical wiring? If using an ST would require modifications, I'll go with another GT for the donor. If there are no differences, the ST donor may be a bit cheaper, so please let me know which way to go. Almost forgot, sons car is an automatic, does it make any difference if the donor car is a 5 speed or auto? Thanks.