2 Transit flights for different countries

I´m travelling from NZ to Tokyo on the 18/6 with two conecctions in China( Xi'an 2hrs and Tianjin 8h) Then on the 5/7 I´m travelling from Tokyo to SF with a connection in Beijin of 4h. Will I have any difficulty in this case? Since both trips are connection flights but with less than a month of difference. Thank you