Assuming your HX is OBD2 and the VX is not, you will have a multitude of problems without practical solutions. One I know of is the OBD2 capability of reading the engines cylinder balance while it is running. This is done with a sensor that actually counts the teeth on the starter ring gear as the engine is running. Since the VX never had this capability you will get an error code without the sensor.
I can virtually guarantee you the ECU will not work. You may be able to swap the guts from the VX tranny but without the HX bellhousing and the previouslymentioned sensor there and functioning you will have a check engine light on constantly, which will fail inspection in a lot of areas.
regards
Mech
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