Kefir grains can change in appearance for any number of reasons including, the type of milk you use, temperature they are held at, etc.
If they are *growing*... they are likely very healthy and I would not fret about it.
In addition, If you are anything but gentle with them, you will find that these *chains* will easily, dependent upon temperature held at, break apart.
>>"are my non-granular grains ok?"<<
they are okay.
>>"Are they just a different variety?"<<
There is something you need to know about microflora, within different environments, they can, and do change form and function; the food you give them (what kind of milk - or other growing medium), temperature, pH, humidity, etc. etc.
They are likely the same as those you have purchased with the possible exception of any variety (ies) of microflora that have joined the *chain* as introduced to them... This makes them stronger IMO.
Extrapolate that to the environment of, and the microflora in, your gut... what kind of environment do you provide for them; food and liquids do you feed them?