Is there an upgrade path to bring a JSB license up to a JSE license.
You can contact your accounts team . They can do the upgrade of JSB license . If you are unsure , check with Juniper Customer care team and the will direct you .
There is no official upgrade SKU.
As stated it can be done via your reseller by help of the Juniper account team to give you a special discount on the JSE license which compensates for already having bought the JSB license.