Looking for Rice North!

If one uses the Carnegie Classification, one comes up with:

Boston College
Princeton

https://carnegieclassifications.iu.edu/lookup/srp.php?clq=%7B%22ipug2005_ids%22%3A%2211%22%2C%22ipgrad2005_ids%22%3A%2215%22%2C%22enrprofile2005_ids%22%3A%225%22%2C%22ugprfile2005_ids%22%3A%22%22%2C%22sizeset2005_ids%22%3A%22%22%2C%22basic2005_ids%22%3A%2215%22%2C%22eng2005_ids%22%3A%22%22%2C%22search_string%22%3A%22%22%2C%22first_letter%22%3A%22%22%2C%22level%22%3A%22%22%2C%22control%22%3A%22%22%2C%22accred%22%3A%22%22%2C%22state%22%3A%22%22%2C%22region%22%3A%22%22%2C%22urbanicity%22%3A%22%22%2C%22womens%22%3A%22%22%2C%22hbcu%22%3A%22%22%2C%22hsi%22%3A%22%22%2C%22tribal%22%3A%22%22%2C%22msi%22%3A%22%22%2C%22landgrant%22%3A%22%22%2C%22coplac%22%3A%22%22%2C%22urban%22%3A%22%22%7D&limit=50&unit_id=227757&start_page=index.php&basic2005=15&ipug2005=11&ipgrad2005=15&enrprofile2005=5&submit=FIND+SIMILAR

If you are willing to accept a more “liberal artsy” skew in the mix of undergrads then you can add:

Brandeis
Brown
Chicago
Dartmouth
Notre Dame
Rochester
Tufts
Wash U

If you consider who the Astronaut Scholarship foundation partners with:

Mudd
Hopkins
MIT
Tufts
Chicago
Rochester
Wash U
https://astronautscholarship.org/universitypartners.html

If you are interested in access to the latest space imaging data…

https://pfs.ipmu.jp/intro.html

Caltech
Columbia
Tufts
Princeton
Hopkins
https://pfs.ipmu.jp/people.html

https://now.tufts.edu/articles/new-eye-cosmos

If you are interested like minded students and space related extracurricular activities:
Students for the Exploration and Development of Space - (Schools with chapters}

Rice
Brown
Colgate
Columbia
Cooper Union
Hopkins
MIT
Princeton
Tufts
Penn
Yale
Chicago
https://seds.org/public-chapters-list/

All things considered, Princeton might be the closest match, but that is a pretty tough admit.

If you are willing to put up with a more liberal artsy environment, and are truly looking for something small with an undergrad focus, then Tufts could be a good fit - just make sure the theoretical offerings are sufficient, because the physics department is relatively small and Tufts tends to skew toward the applied side at the university level. Tufts does have a longstanding relationship with MIT in the area of Cosmology - which is one of the more theoretical areas - and one of the recent Nobel winners from MIT was previously a prof at Tufts. (Tufts and MIT are about 4 miles apart, with a school that is not to be named halfway in between).
http://cosmos2.phy.tufts.edu/joint-seminar/