Wood Sash Lock P/C 90-320

A quick learner says:
I found you have #90-281 that is very close to my size in my Hurd window. The difference is that mine is not fastened from the top. Instead, it is fastened from the side (like #90-320). I assume that #90-281 will work - or do you know why it would not?

I found a discussion under #90-320 referencing a Hurd double hung window that has the exact same latch. I added to that discussion with a question about whether I need to also buy a new keeper. My old keeper (exact as in that photo) is in tact
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Emily from SWISCO responded:

Thank you for reaching out to us. Before we recommend anything, can you remove your old keeper from the window and show us some photos? 

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