If how a junction view looks is so important to you, you may try getting old junction view files from previous years and see if they show with Tomtom maps (you may need the licenses as well). After all, it's not that they change the highway exits every year. My guess is Here shows the most sophisticated views depending on some pattern or info in the map file (fbl) that may be wrong or missing for some reason in the map.
You can use older files with new ones from the same provider. That doesn't guarantee that Tomtom's are going to look so real as Here's. What you see now(wit Tomtom) is the basic NNG junction views that are probably inside the .fbl file. Check older threads in the maps section and check if older Tomtom maps have the fjw files(and license).
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