Hi chicojerry,
Lifekind and OMI are “sister” companies with the same ownership but with different mattress designs. They don’t have the Terra in their lineup (which is an OMI model).
There is more about “matching” one mattress to another in post #9 here. While it would be fairly simple to match the Terra mattress in terms of the type and quality of the materials (which are available to many manufacturers) this doesn’t mean that two mattresses will feel and perform the same way in terms of PPP because every difference in design or components between two mattresses (including layer firmness, layer thickness, and the cover and quilting materials) can have an effect on its feel and performance. If you talk with Lifekind on the phone though they should be able to tell you which of their mattresses are closest to the Terra design (they would likely be familiar with the OMI mattresses). The only time a match would be exact would be if every layer and component were exactly the same.
In some cases you may be looking at an approximation because another manufacturer you are considering may not use the same layer thicknesses, have the same firmness levels available for each layer, use a different cover or quilting, or have other differences that aren’t available elsewhere (such as the “sculpting” of the latex). Once you know the specifics of a mattress you are trying to “match” (which hopefully has a fairly simple design and where the type of materials and the quality and comfort specifications are known or can be found out) then it may also be worth considering the manufacturers listed in post #21 here which includes the members of this site that sell latex mattresses online and you can look for mattresses that use the same type of latex in a design that is as close as possible to the Lifekind you are trying to “approximate”. They are all knowledgeable and helpful on the phone, use good quality materials (including the same type of latex that OMI and Lifekind use), and if they know the details of a mattress you are considering then they can help you decide which of the options they carry may be closest to the Lifekind you are considering (even if it isn’t the same).
Phoenix