weird, on the contrary, I've never seen cana coco natural.
I've been doing coco for years now, also mapito and RDWC, but came back to coco and sorry I ever left

. I am a coco-nut
99% of the time Canna, sometime in emergency I'll go with what's available.
Canna Pro is pre-washed, buffered and has trichoderma. Ready to go straight out of the bag. Nave no clue about Coco Natural, but I presume it is what it says, natural… So I presume, you must do like the old school guys did… rinse/wash thoroughly to get rid of salts, flush with pH balance handsomely with a minimum EC of 0.6 to maintain cation exchange function, "activate" with trichoderma harzianum, which is a fungus that acts like a fungicide (no joke) and prevent a sh!t load of common pathogens. Great for foliar too, and very very cheap at a specialised horticulturel/greenhouse store. And if you happen to pop in there, might as well also bring back some agro-bacteria and other myco's, all of which work perfectly well together, great with all nutrient types, and will turbo charge your coco grow. Heck, I do this myself with Canna Coco Pro. Very very easy to do, just a little more trouble to start off.
For instance, you can also get coco blocks at fish/bird/reptile shops. Coco for reptiles does not permit trichoderma, which is only great for plants. But perfectly useable for plants if you amend it right.
Being your first run, I'd recommend keeping it simple and trying to source Canna Coco Pro, of other specialized brands, like Botanicare, Biobizz, etc. If you can't find them, not a big deal, really, don't stress too much about it.
If you can't find trichoderma, bacteria, etc, you can do all of the above with high grade worm casting.
Don't be intimidated by all this rambling. Just love sharing info and happy to answer any questions you may have. Hell, just buying Canna natural, and planting and feeding correctly should produce great looking plants without issue. I see many coco grower using sterilization products that completely destroy trichoderma/bacterial/myco's etc, and they have great yields too.
Just trying to explain the basics of coco, and the
probable difference between the Pro and the Natural (again, never seen the Natural before, so take all this with a grain of salt)