Do I fit t-SNE the two sets of embeddings from two different models at the same time or do I fit each separately then visualize and compare?

I have two sets of embeddings from two different GNNs. I want to compare the embeddings by visualization and I want to know which way is the most appropriate way for comparison. Do I fit t-SNE separately for each set of embedding then use the scatter plot? Or do I fit them all into one t-SNE?

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