Critter's Choice Tasty Sticks 75g Small Animal Treat

Critters Choice multicoloured sticks are GREAT as all my gerbils and degus absolutely ADORE them above all others. Snatched from my fingers immediately. They love them!
Never could understand their adoration as the only ingredients were wheat flour and water, no other additives, not even colouring admitted.
However with a recent order for 6 CCTS
I received a different brand called HAPPY PET Tasty Sticks by Multipet International. Different ingredients that now include yeast, eggs, fats and oils. Find this rather concerning. Surely this is stuff they shouldn't be consuming? Still snatched from me.....

All I have to do is shake the packet and my degus or gerbils come running, falling over each other to get to them. However
I don't quite "get" their fervent attraction to these, as there is no specific flavour or scent to them, and the listed ingredients on CrittersChoice are plain Wheat Flour and water with No flavourings despite colourings.
My furries absolutely ADORED them and size was ideal. They came in finger length thin sticks that snap easily into 1/2 or 1/3, in bright colours from green, pink, orange, purple, yellow, to white and brown.
I only rated it for Tastiness at 3 because (to me) they are all seemingly the same and quite odourless but in my Pets' Opinion it is 5 (or more!)
More accepted than a number of other so-called herbal or alfalfa treats available that are too large for their mouths.
Recently ordered CC specifically but received packs named HappyPet.
Different composition that included Eggs, Oils & Fats, Yeast. Is this ok for my furries.
Prices also vary. Used to get them for £1.99 a packet but depending on seller can go to £2.90s.