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HRM Strap difference compared to 630

I'm thinking of buying 230 for myself and giving 235 to my better half (it seems OHRM work better for her) and I'm wondering if there is any difference in HRM strap between 230 and 630. I see that 630 uses HRM-Run while somewhere I see that 230 is using HRM4.

Can someone explain the difference? Thanks!