No, the US A1000 will have serious issues with PAL games and the hardware is tied to either PAL/NTSC without a chance to modify.
There is both PAL/NTSC thin Agnus (Agnii?), but not an universal one like in the A500. Also the mainboards are completely different.
The PAL A1000 doesn't have a daughter board.
Other parts are fully interchangeable (floppy drive, mouse, case & keyboard). Only the power supply and mobo aren't.
Even the Workbench is tied to PAL or NTSC regions (versions 1.0, 1.1 & 1.2).