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I'm not an expert on this solar stuff (usually prefer it and the moon would just get out the way), but...
I believe the extra filter is simply like the 60mm I used but a 40mm. The thing is I think it's higher quality (shorter wave length range??) so it enables you to see lots more detail in surface and prominances. That's about all I understand.
Of course a PST is never going to compare in viewing quality to a 90mm or solarmax or whatever they are, from what I have seen and tried it's simply not possible to get the sunning high detail photo's using a PST, all comes down to resolution, filtering range and cost I guess..
Roger.
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