What is the difference between YUVFormat.YUV_420 and ColorSpace.YUV420?

I have searched through and have read a ton of sources, but I cannot seem to find an answer. I thought these "types" were equal, but when I decode h264 into bytes using jcodec I assumed the data output was YUV 4:2:O Planar (YUV420P); this is the expected input type for my VPX encoder. The VPX encoded image looks like this:

So I have to assume that while YUVFormat.YUV_420 is most likely YUV420P, the ColorSpace.YUV420 is some other variant of YUV420. Does anyone know which variant it is so that I can find a conversion routine?

One format interlaces the u and v data for a full scan line. the other writes the entire U and then the entire v data. These are after the entire Y image. yuv420 and yuv420p specifies which layout. yuv420 writes all the u then all the v data, yv420p interlaces the u and v data scan line by scan line. This image can be a little misleading because the data size is small enough to not show large blocks of u and v pixels.

I believe yuv420p would interlace the U1U2U3 V1V2V3 U4U5U6 V4V5V6