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I don't think so. RGB isn't space agnostic. When you convert from Rec601 YUV to RGB format you do it with Rec601 coefficients and end with RGB in Rec601 color space.
Assuming the RGB is in Rec709 as in RGBToYCbCr(RGBToYCbCr_mat("709")) is therefore wrong without a prior gamut conversion between 601 and 709.
In any case in RC3 I had some mistakes with the format conversion assuming PC levels where it shouldn't, so for the time being just avoid using Transforms Pack in production. I fixed it already internally in RC4 but it's not ready for release (tangled in modern HDR compliant formats like ICtCp and IPT-PQ).
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