Difference between <Instance-gen9> and [gen9] ?

[Christine DG]

How to convert

<Instance-gen9> (the value of ?self)

to
[gen9] returned by (make-instance) ?

CLIPS> 
(find-all-instances 
    ((?y Conv_unit))
    (eq ?y:conversion [gen9])
)
([gen10] [gen11])
CLIPS>
(find-all-instances 
    ((?y Conv_unit))
    (eq ?y:conversion <Instance-gen9>)
)
()  ; <---------- EMPTY
CLIPS> 

[Christine DG]

Sorry, I have found the solution.
I just have to use (instance-name $self) instead of $self which is an Instance-adress.