Different speeds are shown in different countries, one thing is for certain and that is that the speed guns are varying in each country one recent example is of Tino Best, he was clocking 150+ in Australia and in just a few weeks when playing against Zimbabwe in West Indies he struggled to cross even 145ks even though his deliveries looked quicker than what he was bowling in Australia.
I think the speeds shown by the Tensports speed gun are a bit too slow and the speed guns in Australia show the speed to be a bit more, for me the most accurate speed guns are the one used in the ICC tournaments and also the ones that are used by India.