1. No it cannot. You need to apply for a new tier 2 general visa if they are an ho approved sponsor, from your home country and the 12 month cooling off period light apply. The right to hire agreement between the companies has nothing do with visas and sponsoring a worker.
2. No change. What is the SOC and salary?
Char (CR001 not Casa)
In life you cannot press the Backspace button!!
Please DO NOT send me a PM for immigration advice. I reserve the right to ignore the PM and not respond.