As far as the 1130 goes I think the key fact here is that the OP says his loco has the slot for the reverse unit fiber lever. The 2034 die cast shell never had this slot, I believe.
I've handled three die cast 1130's. One I sold to a variation collector many years ago for a nice price. Two I still have. The one I sold and one of the ones I have did/does not have the slot in the top of the boiler. The latest one I acquired does have the slot. I thought maybe a redo by someone but I can't tell. It's not a repaint and the 1130 stamping looks identical to the one without the slot.
Here are three 1130's from my for sale box. The top one is cast without the slot. A verified variation. The middle one is the common plastic version with weights. The bottom one is die cast but with the reverse lockout slot.
Maybe there are more die cast 1130's out there that have the slot? Legitimate variation? I don't know.
