Spells: Naltron's Mark gives too few hp?

[kaev]

Symbol of Naltron buffs target for 525hp, Naltron's Mark only buffs for 406hp. Note that these values are the max & min for both spells according to the wiki.
3 : UNKNOWN CALC 118 base 406 max 525 attrib Max Hitpoints
4 : UNKNOWN CALC 118 base 406 max 525 attrib HP when cast

The wiki lists the spells with identical effects and durations, which certainly is consistent with similar Kunark-era single/group spell pairs such as Heroism & Heroic Bond

Also, Naltron's Mark doesn't overwrite Symbol of Naltron (a good thing given the amount of hp.)

Apologies if this has been addressed elsewhere, found nothing about this searching both Bugs and Resolved Issues.