The PanelView Plus 1250 and 1500 models share the same resolution screen and the same logic module, so if there are no other differences between the terminals the Runtime file should behave exactly the same.
26040 - PanelView Plus and VersaView CE screen resolution
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PVP 400 = 320x240
PVP 600 = 320x240
PVP 700 = 640x480
PVP 1000 = 640x480
PVP 1250 = 800x600
PVP 1500 = 1024x768
From the above you will notice that the PVP 1250 has a resolution of 800x600 and the PVP 1500 has a resolution of 1024x768. If you change "Project window size" in an application, to one of a different resolution, then you will be prompted that scaling of the displays must be performed during conversion.
But yes, it is all quite possible. The level and complexity of the application's graphics and/or images used will determine how successful the conversion will be. If the graphics or images end up distorted looking then you cannot revert. That is why they advise you to backup your application before attempting to change the application's window size.
So just back it up and then try change to a PVP 1250. You might have to mess around with some of those scaling options to get it right. But then again, you might not?