6.1.7601 == 2008 R2
2008 non R2 would be 6.0 something, probably 6.0.6001
https://support.microsoft.com/en-us/topic/hyper-v-integration-components-update-for-windows-virtual-machines-8a74ffad-576e-d5a0-5a2f-d6fb2594f990
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