Comparing two openvdb::DoubleGrids to see if they are exactly the same

[Pindrought]

I am currently trying to rewrite a project that is utilizing openvdb.
I am needing to replace the calls to the following:
tools::meshToSignedDistanceField() as well as tools::volumeToMesh()

My goal is to remove all dependencies to openvdb / its requirements (tbb/boost/zlib/etc) and to still have the same functionality offered by these two functions.

I have two questions.

1. Is there an alternative option to openvdb anyone recommends to save the time trying to extract all of this out of the library that offers the exact same results as these two functions (specifically for DoubleGrids as that is all that I am using - floats would be fine as well though)?
2. Assuming i'm going to just rewrite all of this to remove the dependencies, is there any proper way to compare two DoubleGrids? I tried just with ==, but it is just using the operator from the MetaMap class and not taking all of the other variables into consideration. This will result in == showing true even though the two DoubleGrids are different. I was thinking maybe all I needed to add was comparing the trees in both of the grids, but the comparison for trees is not implemented.

Thanks so much!