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LoginAs RJ as stated, the plan is for Version 2 to be fully compatible with Version 1. However, none of the Version 1 boards will work with the transceiver being used on the Version 2 - the transceiver has a different footprint.
You can fully populate the version 1 and have confidence you can use a mixture of version 1 and Version 2 units.
If you need the signal to carry a significant distance.... say more than 300 feet, you may want to use the Version 2 transmitter because of the increased strength of the module being used in version 2.
Larry