Hi , @Anonymous
I create the test data by Button-OnSelect:
ClearCollect(database1, {'Client Id':1,Name:"Sam"}, {'Client Id':2,Name:"Ram"}, {'Client Id':3,Name:"DamUpdate"}, {'Client Id':4,Name:"Tam"});
ClearCollect(database2, {'Client Id':1,Name:"Sam"}, {'Client Id':2,Name:"Ram"}, {'Client Id':3,Name:"Dam"}, {'Client Id':4,Name:"Tam"},{'Client Id':6,Name:"Bam"},{'Client Id':7,Name:"Fam"})

We can use code in the TextInput2-Default:
If(TextInput1.Text<>"" ||TextInput1.Text=Blank() ,
If( LookUp(database1,'Client Id'=Value( TextInput1.Text)).Name=Blank() ||LookUp(database2,'Client Id'=Value( TextInput1.Text)).Name=Blank() ,"no result found." ,
If( LookUp(database1,'Client Id'=Value( TextInput1.Text)).Name = LookUp(database2,'Client Id'=Value( TextInput1.Text)).Name , LookUp(database1,'Client Id'=Value( TextInput1.Text)).Name
, "no result found.") ))
Best Regards,
Yueyun Zhang