QUERY REGARDING CBC. 1 hr? 7 in one day?

I went for two CBC tests yesterday and both reports vary by a fair margin . One lab says my Hb is 13.1 and Platelet count is 80,000 and the other lab says my Hb is 13.7 and Platelet count is 1.5 lakh. Which is right ? Both have also attached their machine generated report as well. One machine report says one thing and the other says something else . Who to believe ? For your Kind Information my Hb on 17 Dec 2019 was 13.9 . Can Hb levels vary in healthy individuals within a span of 1 hr ? Can it become 13.1 to 13.7 in one day ? Both the above reports are of 1st June 2020. Plz help. If I compare my Dec 2019 report with one report then it says Hb has fallen by 0.8 gm and if I see the other one then it says it has fallen by 0.2 gm. Plz guide me.