no, stem ginger seems to be different from the usual fresh stuff:
"Crystallized stem ginger – Pieces of candied ginger are rolled in fine cane sugar to make this delicious sweet.
"Fresh ginger is actually the root of the plant and is often known as root ginger. It has a refreshing aroma with a hint of citrus and has a knobbly appearance, a thick skin and a light yellow flesh.
"Fresh ginger in sunflower oilThis convenient form of fresh ginger (sold in a jar with the herbs and spices) can simply be added to dishes when the flavour of fresh root ginger is required."
"Ginger syrup A delicious golden-coloured syrup flavoured with natural ginger, this is a really convenient form of ginger for both sweet and savoury dishes. It is sold in bottles"
"Ground ginger Fresh ginger is dried and ground to a powder to make ground ginger. It has quite a different flavour from fresh ginger and the two are not interchangeable. Ground ginger has a sweet, warm aroma and a spicy flavour."
And "Stem gingerAlso known as preserved ginger, stem ginger is young ginger that has been peeled and preserved in sugar syrup. The syrup is usually quite sweet and provides a good contrast to the spicy, golden nuggets of ginger"
That's a lot of info about ginger that i didn't know!! I will try that section in sainsburys, thanks – was there earlier but didn't think to check that bit. doh.