FCPGA is a packaging technology. Slot-1 is a CPU form factor. The two things are not directly comparable like that.
I think what you may be getting at is that Slot-1 and Socket370 are electrically compatible (remember the slockets?), and many Socket370 processors are shipped in a FCPGA package. An AthlonXP is also a FCPGA packaged chip though, and is about as far from compatible with either Socket370 or Slot-1 as you can get.
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