Multiple motheboards, question on IMEI

Hi. First post here. I have Samsung Galaxy S2 T989 with cracked screen. I bought a same fully functional donor phone and reused my old motherboard. Everything is working great and I made fresh ClockWorkMod backup. I was wondering how can I use the 2nd motherboard for experimental ROM testing purposes? The donor phone came with its unique IMEI code. From what I understand a SIM card is tied to specific IMEI code so to use spare motherboard and retain network connectivity I should be using IMEI from original phone? It seems this could be done by restoring ClockWorkMod backup--essentially duplicating /efs directory & IMEI onto spare motherboard.

The donor phone however is missing a serial number on a back sticker, and its string in settings/info was 000...what could that mean?

1. Is it possible to use 2 unique IMEI numbers on 1 SIM card? My reasoning tells me no.
2. Would having same IMEI on 2 motherboards pose an issue?

Any tips are appreciated before I screw things up.

Kyle.

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