Using old lens and barrel on new instruments. Will my old s4 barrels transfer to the new s4-2 LED instruments

We need to upgrade our Instruments, but, being a non profit, we have to save where we can. We have 16 Source 4 instruments-age unknown but in good shape. We would like to go with the new  S4-2 lustr or lustr+. Will the old barrels transfer?

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