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As a spell slinging rogue can I take both Magical Trickster and Sly Striker to add precision damage to my spells against targets that are not flat footed to me?
Generally speaking, Spell Attacks do not use the Strike action, so no.
In general, PF2 tries to avoid having combinations of feats and abilities that build on each other accidentally. If they are meant to work together, they will generally say that rather obviously. Often by the later feat having the previous one as a prerequisite.
Places where that type of combinational power boosting does happen will usually get removed. For example the Horse animal companion that simply by existing and using their support ability could boost the damage of attack roll spells.
As a spell slinging rogue can I take both Magical Trickster and Sly Striker to add precision damage to my spells against targets that are not flat footed to me?
RAW: No. Sly Striker applies only to Strike and only if you’re using a weapon or unarmed attack you could deal sneak attack damage with.
RAI: Maybe. Magical Trickster works like a feat to basically allows to do Sneak Attacks with attack spells. You and your GM can accept this intent could be valid to other Sneak Attack modification feats once it's works like as an "additional weapon" that you could use to Sneak Attack and can allow other Sneak Attack modification feats to work with it.Balance: No problem at all. I don't imagine that the little extra damage vs non-flat-footed opponents would break anything. Your attacks won't be stronger than normal attack spells vs targets with flat-footed condition anyway.
Being honest due how attack spells are less efficient yet more in a character with reduced spellcasting proficiency progression like a rogue with some spellcasting MC disallow a rogue don't use Sly Striker with spells just penalizes it even more.