Minor name difference between expired and new passport.

[afin]

My mother has a valid B2 visa on her expired passport and she got a new passport. Unfortunately, there is a minor difference in name between old and new passport ie., In old passport, there is a SPACE between two words in FIRST NAME and LAST NAME. Eg. FIRST NAME: WORD1"SPACE"WORD2 LAST NAME: WORD1"SPACE"WORD2. but, in the new passport there is no space between words in FIRST NAME and LAST NAME Eg. FIRST NAME: WORD1WORD2 LAST NAME: WORD1WORD2

In B2 Visa, name is printed as in the old passport with a space between words. Will it be OK at port of entry or we should change the name in new passport to include a space as old one? Please help me.

[peace999]

You should get it changed.
Name is a very important part of the passport and any discrepancy
may create later issues as these passports are machine readable.

[afin]

You should get it changed.
Name is a very important part of the passport and any discrepancy
may create later issues as these passports are machine readable.

Thank you for the reply. Can you please explain what kind of issues may occur at the time of port of entry?