Your recruiter at the first company will tell you no. Your recruiter at your current company will tell you it is ok. Some rumors have it that some hospitals will not let you come in with the second company. These hospitals need travelers because they need to have staff and I think probably do not care.
Have you had a phone interview with the manager previously? If so then call the manger and explain your situation. I would simply let them know that you had previously been submitted to them for consideration by companyA. Now you are working through company B since they were better able to meet your needs. Would it cause them any difficulties?
I did run into a similar situation a couple of years ago. I was submitted to a hospital by company and turned down the job due to personal reasons. about a month later I signed up with company B. Lo and behold they offered me a much better contract. For the same position. They were not going to try and make me pay part of my housing. Pay rate was better. The holiday payscale was 3x what company A offered. So obviously I accepted through company B.
I did not really shop around it was more of an incidental occurance on my part that they offered me the same hospital. Company A Who would not take no for an answer kept trying to get me to take the contract though them and I kept refusing. I finally told them I had in fact taken a contract with another company. They tried to bully me, they accused me of lacking integrity, then they tried to guilt me into going in with them instead of the other company. They kept having different people calling me congratulating me for traveling with them then we would go through the whole thing over again. It all culminated with my original recruiter calling me and again congratulating me on traveling with them and yet again I informed her that I was absolutely not going with them, she then proceed to curse at me and informed me that I had been wasting HER time before she hung up on me.
Moral of the story go with the better company but don't tell the other guys.
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