Honeywell C300 series C IOTA and series 8 IOTA

Hello,
Our factory use Honeywell C300 series C IOTA DCS. We have C300 series C hardware spare.
Our new project have planned Honeywell C300 series 8 IOTA.
Can someone tell me the difference between the two? and Can i use C300 series C hardware spare
to C300 series 8 IOTA system ?
 
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