If you open MIDI editor and change to Event View (Alt+3) you'll see the channel number is in every message. When you copy a MIDI item the channel number is included.
I assume your external synths are operating on different channels so you when intend the copied item to work with a different synth you'll need to change the channel. There are probably neater ways to fix it but one that works is to select all the copied items in MIDI editor and change the channel number (right click, select "Note channel").
Steve
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