Will IC from 6/05 for 540 series work with 240 series?

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Will IC from 6/05 for 540 series work with 240 series?

Bought IC in 6/05 for 540 series.  Am now getting ready to upgrade my 240...  will the IC for the 540 work for the upgrade on my 240?

 Also...  have there been any changes to IC during the past couple of years? (Support larger drives, etc...)