Hi stephen,
I switched your post to a new thread which helps me follow each conversation a little bit more easily 
The Total latex mattress uses 9" of a higher quality latex (Talalay or 100% natural Dunlop) than the Edsele (which uses a continuous pour blended dunlop which is “mostly” natural) but the Edsele is also a little bit less costly on a “per inch” basis.
They both have a good cover that includes wool.
The Total Latex mattress has firmness options you can choose for both for the comfort and support layers before your purchase and also has exchange options for the comfort layer after a purchase (the Edsele only has one option for both) which may be an important part of your personal value equation.
They are not only different in thickness but they are completely different designs and have different firmness options so they will feel and perform differently yes. Each different layering combination that you have available (either in the support or comfort layers) in the Total Latex Mattress is in effect a different mattress. Thickness makes a difference yes but so does the differences in the ILD of the layers, the type of latex used (Talalay vs Dunlop), the combination of layers used (the Edsele is a single 7" layer of a single ILD and the Total Latex mattress uses a combination of layers that have different ILD’s), and any differences in the quilting and covers between them as well.
[quote]One other consideration is I’m buying this mattress for an ikea bed and I’ve heard they can be non-standard sizes. Here is the bed specification from ikea’s site:
Mattress length: 202 cm
Mattress width: 193 cm[/quote]
This is 76" x 79.5" which is fairly standard for an Eastern King size (which is usually 76 x 80 +/- 1").
Phoenix