Section 521.201(4) of the Transportation Code does indeed allow Texas to suspended your DL if it has been suspended by another state.
The section states: "The department may not issue any license to a person who holds a driver's license issued by this state or another state or country that is revoked, canceled, or under suspension"
Even if you do not have a Texas DL yet, this section still applies. Pragmatically, it means that you cannot try to obtain your Texas DL while it is suspended (which will be for the same period of time that your OK DL is suspended).
Every state in the U.S. has this law when it pertains to a suspension or revocation based on a DUI conviction or a violation of the Implied Consent laws. Otherwise, people will simply go to another state to get a DL when it has previously been suspended, thereby rendering the point of a suspension/revocation moot and baseless.
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