Yes, under the Affordable Care Act, there are 26 rating areas in Texas, and all small group carriers use the same rating areas.
For instance, Dallas and Fort Worth are both in rating area 8. That means that carrier A will charge the same price in Dallas and Fort Worth for two groups with exactly the same demographics. Carrier B will do the same. Though the rates will vary from carrier A to carrier B, identical groups with the same carrier and in the same rating area will have the same rates regardless of which county they are in.