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Yes, under the conditions you described, you are eligible for revalidation after a brief trip from the US to Canada or Mexico. Here are the conditions for automatic revalidation listed at cbp.gov. The last paragraph is about your case, revalidation after changing status to H-1B/H-2B/L/J:
A person is eligible for automatic visa revalidation provided the following conditions are met:
The underlying authorization for the current status continues to be valid for the Form I-129 for non-immigrant workers and Form I-20 for students in F status.
The person's absence from the U.S. was 30 days or less.
The person did not visit any countries other than Mexico or Canada in that period. Travelers who are on a F visa or J visa status are allowed to visit adjacent islands to the U.S.(i.e., the Caribbean).
The person does not have a pending or rejected application for a new visa. Since it is not possible to renew a non-immigrant visa in the U.S., a person on a non-immigrant visa may travel to a nearby country to apply for a new visa.
The person is not a citizen of one of the countries designated by the U.S., as a state sponsor of terrorism.
If you changed your status to H-1B/H-2B/L/J and want to re-validate with a valid or expired visa of a different classification, you can do so provided you meet the requirements under 8 CFR 214.1 (a)(3)(b) [sic] and 22 CFR 41.112(d), you may apply for admission to resume your non-immigrant status.
The regulations it mentions say essentially the same rules: 8 CFR 214.1 (a)(3) and (b) and 22 CFR 41.112(d)