Israel has continued bombarding Gaza’s south despite telling 1.1 million people in the north of the besieged enclave to relocate there ahead of an expected ground offensive.
“We were displaced from Tal al-Hawa to Rafah at the request of the Israeli army, and this is what happened to us. My son is a 3-month-old martyr,” the father of a child killed in an attack in Rafah told Al Jazeera.
You're absolutely right that there will be variance, and that each side has incentive to inflate death counts, etc. Other orgs will likely not produce their own numbers until after this mess is over. Check the Wiki pages or B'Tselem pages on previous assaults on Gaza to see how the numbers can vary, that'll give you an idea at least.