Well what are some cultural effects? Does California have as mucha tate pride as Texas does since it would have been independent the same time Texas would be? What are some political effects?
If we assume both?
Well, both states already have that similar state pride built in, though Texas is larger. Might see a bit of a quasi-alliance between the two, culturally, as they are two states that managed to declare independence and successfully fought for it simultaneously. There'd still be the predominantly Yankee California and predominately Southron California that have major political opposition.
You likely also would have the same component of California built-in, where they could split into multiple states on their own, similar to Texas's own little qualifier. Now, California would likely demand their maximum claims. The butterflies should avoid Nathaniel Trist, so we'll see a California including all of Alta & Baja California at first (like Greater Texas was larger). Then California would sell it to recoup costs, but California would likely be larger than OTL, including either Baja or parts of Nevada.
Politically, it wouldn't be much different, except that the US would have a much stronger presence on the West Coast. when the civil War erupts, the Californians will be able to counter any Texan western push far more easily than OTL. Oregon should likely be the same, as while there seems to be earlier immigration to California, it wouldn't be
much more than OTL.
But, in the end, the West Coast will end up slightly stronger and more influential, but California will also consider itself separate from the other Pacific states for the same reason that Texas considers itself separate from the Southern States.
Although, i would say that California is already quite proud of itself OTL. The pride might be just as much as Texas, but simply more along Texas lines.