The datasheet shows the difference is pack size but under lead finishes it says CALL TI on the one without /2K5
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Hi Joe,
Other than package size difference, they are identical based on the material contend database, see the link below.

https://www.ti.com/materialcontent/en/report?pcid=31419&opn=OPA277UAE4
If you have additional questions, please let us know.
Best,
Raymond