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The pin numbers on relays do have meanings. Here's a chart explaining what they mean:
http://www.vintagebus.com/wiring/defs.html
I haven't tried the interchange and I can't say with any certainty that it can't be done (heck, nearly anything can be done if you've got enough will) but I can say that if the pin numbers are not the same then you'll have to do some thinking to adapt the one to the other.
Reminder: brand-new 140 headlight relays are now readily available and not particularly expensive.
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