If you get a company that actually says National
Broadway touring company, it should be of the same caliber. The actual Broadway producers, muscial director and stage managers will have final approval over the cast.
If you get an older show coming through by XYZ Touring Company, then, well yeah, you will get lesser talent.
A dear friend of mine is a Broadway actor who has also starred in tours. Many Broadway actors go on tour as there are only a limited number of roles they can play on Broadway at any one time, but there could be 3 National Broadway Touring Companies out on tour at the same time, with the same show, in various regions of the country.
My friend has told me he's been able to negotiate to later play the same role (or better) in the Broadway show when they need a replacement, once he comes off the tour.
Broadway producers, when casting, give first dibs to people who've done various Broadway touring companies because they know these actors understand & have been through the similar rigors of 8 performances a week, as on Broadway.
Likewise, when a tour needs to be cast, they will cull Broadway actors first, as they don't want someone dropping out unexpectedly in the middle of a tour because he didn't understand how demanding it would be.

In the end, they all know each other and are true Broadway gypsies.
