PG 9.5 2 tables same DDL with diff size

[ghiureai]

HI List

I am trying to understand the following :
have 2  identical PG cluster on diff hosts, same postgresql.conf, same 
db schema :

 same tale DDL and row counts but different size ( 14GB diff  ), I run 
reindex and full vacuum analyze,  but I can not decrease the size of 
larger table(50GB) to match the size in second

PG cluster.

any tips what can make this 2 tables to have diff size except the host ( 
same OS and PG version 9.5.3)?


Thank you